Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

refactor code so it can run in a chroot without having to have /dev/mounted
MFC After: 1 week

Allow one to specify the AWK used in the environment(commandline).

Gawk is blowing up when run natively on the sparc64 -- leading to totally
bogus kernel values (all "0x0"). Good ole BWK awk works fine however.

brace by itself after function declaration.
Mandated by: style(9)
Pointed out by: rwatson

Improve kernel bootstrapping:
o Use objdump instead of gensetdefs(1) to build the linker sets.
o Allow overriding of nm and objdump in resp. genassym.sh and
gensetdefs.pl for non-native toolchains.

Reviewed by: arch
Perl improvements: Jos Backus <josb@cncdsl.com>, benno

Use "nm | awk ..." instead of genassym(1) to generate symbol value headers.
Symbol values are now represented using array sizes (4 arrays per symbol
so that 16-bit machines can represent 64-bit values) instead of being raw
binary values.

Reviewed by: marcel